NASA has released a new photo taken by the Mars Curiosity rover including two showing what appears to be a light on the distant horizon. The photograph, included in a series of raw images just released, have gone viral in the space media, but the space agency has had no official comment.

The rover took the photo after arriving at a small rise in the Martian landscape to examine a place where four different kinds of rocks intersect. The area is called "the Kimberly" after a location in Australia.

Is the light some underground home of intelligent life? Is it an as-yet-unexplained natural phenomenon? Speculation is rampant, of course, but many more seasoned commenters are pointing out that NASA has said nothing yet. "The usual excitement before they discover the mundane truth," one comment said on Reddit Tuesday morning.